Gramophone-brake.



(No Model.)

Patented May" 27, I902. E. B. JOHNSON.

GBAMOPHONE BRAKE.

(Application filod Aug. 8, 1900.) r

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GBAMOPHONE BRAKE.

(Application filed Aug. 8, 1900.)

2 Shoots-Sheet 2 (No Model.)

. Urvrrn Sterne ELDRIDGE R. JOHNSON, OF PHILADELPHIA, PENNSYLVANIA.

GRAlVlOPHONE-BRAKE.

SPECIFICATION forming part of Letters Patent No. 700,937, dated May 27, 1902.

Application filed August 8, 1900. Serial No. 26,276. (No model.)

To all whom, it may concern.-

Be it known that I, ELDRIDGE R. JOHNSON, a citizen of the United States, and a resident of the city of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Gramophone Brakes, of which the following is a full, clear, and exact description reference being had to the accompanying drawings, forming part of this specification.

My invention relates to an improved turntable brake for gramophones and other soundreproducing machines.

The principal object of my invention is to provide a simple and efficient device for stop ping and holding the turn-table or recordsupport of a gramophone or other similar device.

A further object of my invention is to provide, in connection with the brake, means for automatically operating said brake to stop the turn-table immediately upon the completion of the reproduction.

lVith these objects in view my invention consists in the construction, combination, and arrangement of the parts, such as will be hereinafter fully set forth, and pointed out in the claims made hereto.

In the accompanying drawings, in which similar letters of reference are used to indicate similar parts, Figure 1 is a top planview of a gramophono having the turn-table and reproducer removed therefrom. Fig. 2 is a side elevation of a gramophone, illustrating the turn-table and the reproducer, a portion of the reproducer-arm and its supportingbracket being broken away and showing my improved brake mechanism in front elevation. Fig. 3 is a plan view of a sound-record, illustrating the means for shunting the reproducer-arm after its stylus-point has reached the terminus of the record-groove. Fig. at is a detail perspective view of the brake having the mechanism for automatically operating the same removed therefrom.

Referring to the said drawings, A designates the casing, containing a suitable motor for running the turn-table B. On the top a, of the casing I provide a lever C, pivoted at c to said top, as illustrated. The free end of the lever O extendsa slight distance beyond the circumference of the turn-table and is provided with an upturned end c, which carries on its front face a forwardly-projecting stud 0 which forms a handle by means of which the brake may be operated, as Will be hereinafter more fully described. Projecting laterally from one edge of the upturned portion 0' of the lever is an arm 0 which has secured therein a friction-teat 0 A short distance back of the pivotal point 0 of the lever O, I provide a lug or collar (1, which is rigidly secured in the top plate a of the casing on a line with the pivotal point e and the center of the turn-table. A bowed spring (1 is rigidly secured at one end in the log at and has its other end loosely secured in the lever O at a point in front of its pivot c, and the elasticity of said spring is exerted in an inward direction, so that after it is placed in position it is always under tension. On the side of the lever O opposite the spring cl I provide a stop-pin c, which is secured in the top plate a of the casing and against which one edge of the lever O bears when the brake is in normal position and out of contact with the turn-table, as illustrated in Figs. 1 and 4 of the drawings.

On the side of the lever O opposite to the spring cl I provide an arm or lug f, disposed at right angles to the said lever O, and'pivoted to the end of this lug is a link or rod f, which is connected to an arm g, which is socured in a block g, pivoted at g to the top plate of-the casing. This arm 9 projects a short distance beyond the periphery of the turn-table B and is bent up at its end, as illustrated in Figs. 1 and 2 of the drawings.

On the under side of the reproducer-supporting arm E of the gramophone I provide a downwardly-extending arm h, so located with respect to the turn-table as not to touch the same when the said arm is shifted laterally away from the center, but so located as to come in contact with the arm 9 after the reprodueer-needle or stylus-point has reached the terminus of the record-groove.

The record-disk D has on its upper surface the spirally-arranged record-grooves Z, adapted to be engaged during the operation of the machine with the stylus-point Z of the reproducer L. These grooves Z commence at a point near the periphery of the record-disk and recede spirally toward the center of said disk,-

as clearly illustrated in Fig. 3 of the drawings, and stop at a point less than half the length of the radius of the disk, the length of the grooves varying, of course, according to the length of the matter recorded. A short distance inside the terminus of the grooves Z I provide a circular groove m, which is concentric with the axis of the disk. I then describe a curved groove m, tangent with the terminus of the grooves Z at one end and tangent at its other end with the opposite side of the concentric groove m, thus forming a continuous groove from the terminus of the spiral to the endless groove m. The purpose of this groove is to shunt the reproducer-arm E laterally toward the center of the disk after the stylus-point of the reproducer has completely traversed the record-grooves, so as to bring the depending arm a. against the projecting end of the arm 9, and thus operate the turntable brake to stop the turn-table immediately after the completion of the reproduction.

When it is not desired to operate the brake automatically, the lever-arm g and connecting-rod f are dispensed with, as shown in perspective in Fig. 4: of the drawings. In this figure the brake is shown in normal position and the spring remains neutral, as both of its connecting-points are on a dead-center; but

as soon as the lever O is moved, so as to bring its point of connection with the spring d off the dead-center, the said spring becomes active and serves to throw the said lever O to one side and bring the teat 0 carried by the arm 0 into close frictional contact with the periphery of the turn-table B and stop the.

revolution of same.

The operation of the automatic mechanism for throwing the brake may be described as follows: After the stylus-point of the reproducer has traversed the record-grooves it enters the tangent groove m, which immediately shifts the reproducer-arm E laterally toward the center of the disk, which brings the depending arm it into contact with the extending end of the lever-arm g and shifts the same, which by reason of the link connection f with the lug f on the brake-lever O shifts said brake-lever or throws it off of its dead-center,- thus rendering the spring (1 active and cansing it to throw the arm c and its teat 0 into frictional contact with the periphery of the turn-table, and thus stop the revolution of the said turn-table, and thereby stop the operation of the machine. When it is desired to start the machine again, the brake-lever O is thrown back into normal position by operating the handle 0 the stop-pin e serving to limit the return movement of the said lever.

From the above description it will be seen that I have provided a braking device for gramophones and other machines of a similar character which is positive in its movements, strong and durable, and not liable to get out of order or lose its elasticity.

Having thus described my invention, What I claim, and desire to secure by Letters Patcut, is

1. In a brake for gramophone turn-tables, the combination with the turn-table, of a pivoted lever secured below the turn-table adjacent the periphery thereof, a friction-teat arranged on the free end of said lever in close proximity to the periphery of the turn-table, a spring connected at one end to the pivoted lever in front of its pivot and at its other end to the casing of the machine on a dead line with its connection with the pivoted lever, substantially as described.

2. In a brake for gramophones and the like, the combination with the turn-table, of a brake-lever pivoted to the frame of the machine below the turn-table, an upturned end formed on the free end of said brake-lever, a laterally-extending arm formed on said end having a friction-teat adapted to contact with the periphery of the turn-table, a spring pivoted to the brake-lever in front of its pivotal point, and having its other end secured to the machine-frame on a dead-center with its point of attachment to the brake-lever whereby'on the moving of the brake-lever the spring is brought into action and the friction teat thrown in frictional contact with the periphcry of the turn-table, substantially as described.

3. In a brake for gramophones and the like, the combination with a revolving turn-table, of a lever pivoted to the frame of the machine below the turn-table, a friction-shoe arranged on the free end of the lever in a plane with the periphery of the turn-table, a spring secured to said lever in front of its pivot having its other end secured to the machine on a deadcenter with its point of attachment to the brake lever, and means for automatically throwing said brake lever off of its deadcenter at predetermined times, for the purpose described.

4. The combination of a revoluble turn-table, a sound-record carried'thereby, a recordgroove formed in said record, a pivotallymounted reproducer-support, a reproducer carried thereby, means for shunting the reproducer laterally when the end of the record-groove has been reached, a pivoted brakelever secured below the turn-table adjacent thereto, a friction-teat arranged on the free end of said lever, a spring adapted to hold the brake-lever in normal position and means connected with the reproducer-support for throwing the brake immediately after the reproduction has been completed, substantially as described.

5. The combination of a revoluble turn-table, a sound-record carried thereby, a recordgroove formed in said record, a pivotallymounted reproducer-arm, a reproducer carried thereby, means for shunting the reproducer laterally when the end of the recordgroove has been reached, a pivoted brake-1e.

ver secured below the turn-table adjacent thereto, a friction-teat arranged on the free end of said lever, a spring connected at one end to the brake-lever in front of its pivot and at its other end to the casing of the machine on a dead-center with its point of connection with the brake-lever, and mechanism connected with the brake-lever adapted to be operated by the reproducer-arm to throw the brake immediately after the reproduction has been completed, substantially as described.

6. The combination of a revoluble turn-table adapted to support asound-record, a pivotally-mounted reproducer-arm, a reproducer carried thereby, means for shunting the reprodncer laterally when the end of the record has been reached, a pivoted brake-lever secured below the turn-table adjacent thereto, a friction-teat arranged on the free end of said lever, a spring connected at one end to the brake-lever in front of its pivot and at its other end to the casing of the machine on a dead-center with its point of connection with the brake-lever, a lever-arm pivoted to the machine-casing having one end extending beyond the turn-table periphery, a link connection between the lever-arm and the brake-lever, and means carried by the reproducer-arm for tripping the lever-arm and automatically operating the brake to stop the turntable immediately upon the completion of the reproduction, substantially as 'described.

7. The combination of a revoluble turn-table adapted to support the record, a pivotally-mounted reproducer, vmeans for shunting the reproducer laterally when the end of the record-groove has been reached, abrakelever pivoted to the frame of the machine below the turn-table, an upturned arm formed on the free end of said brake-lever having a friction-teat adapted to contact with the periphery of the turn-table, a spring secured to the brake-lever in front of its pivotal point having its other end secured to the machineframe on a dead-center with its point of connection with the brake-lever, a projection, f, formed on the brake-lever, an arm, g, pivoted intermediate its length to the casing, a link connecting said arm with the lug, f, and a depending arm, h, carried by the reproducer adapted to engage the free end of the arm, g, after the reproduction has been com pleted, substantially as described.

In witness whereof I have hereunto set my hand this 3d day of August, A. D. 1900.

ELDRIDGE R. JOHNSON Witnesses:

JNo. T. ORoss, LEWIs H. VAN DUSEN. 

